Application/Cqrs/Schedule/Queries/GetScheduleList/GetScheduleListQuery.cs

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+using MediatR;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.Schedule.Queries.GetScheduleList;
+
+public class GetScheduleListQuery : IRequest<ScheduleListVm>
+{
+    public int[]? GroupIds { get; set; }
+    public int[]? DisciplineIds { get; set; }
+    public int[]? LectureHallIds { get; set; }
+    public int[]? ProfessorIds { get; set; }
+    public bool? IsEven { get; set; }
+}

Application/Cqrs/Schedule/Queries/GetScheduleList/GetScheduleListQueryHandler.cs

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+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using Mirea.Api.DataAccess.Application.Interfaces.DbContexts.Schedule;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.Schedule.Queries.GetScheduleList;
+
+public class GetScheduleListQueryHandler(ILessonDbContext dbContext) : IRequestHandler<GetScheduleListQuery, ScheduleListVm>
+{
+    public async Task<ScheduleListVm> Handle(GetScheduleListQuery request, CancellationToken cancellationToken)
+    {
+        var query = dbContext.Lessons.Include(l => l.LessonAssociations)
+            .ThenInclude(la => la.LectureHall)
+            .ThenInclude(lh => lh!.Campus)
+            .Include(l => l.LessonAssociations)
+            .ThenInclude(la => la.Professor)
+            .Include(l => l.Group)
+            .Include(l => l.TypeOfOccupation)
+            .Include(l => l.Discipline)
+            .AsQueryable();
+
+        if (request.IsEven != null)
+            query = query.Where(l => l.IsEven == request.IsEven);
+
+        if (request.GroupIds != null && request.GroupIds.Length != 0)
+            query = query.Where(l => request.GroupIds.Contains(l.GroupId));
+
+        if (request.DisciplineIds != null && request.DisciplineIds.Length != 0)
+            query = query.Where(l => request.DisciplineIds.Contains(l.DisciplineId));
+
+        if (request.LectureHallIds != null && request.LectureHallIds.Length != 0)
+            query = query.Where(l => l.LessonAssociations!.Any(la =>
+                la.LectureHallId != null && request.LectureHallIds.Contains(la.LectureHallId.Value)));
+
+        if (request.ProfessorIds != null && request.ProfessorIds.Length != 0)
+            query = query.Where(l =>
+                l.LessonAssociations!.Any(la =>
+                    la.ProfessorId != null && request.ProfessorIds.Contains(la.ProfessorId.Value)));
+
+        var data = await query.ToArrayAsync(cancellationToken);
+
+        var result = data.Select(l => new ScheduleLookupDto()
+        {
+            DayOfWeek = l.DayOfWeek,
+            PairNumber = l.PairNumber,
+            IsEven = l.IsEven,
+            Discipline = l.Discipline!.Name,
+            TypeOfOccupation = l.TypeOfOccupation!.ShortName,
+
+            Group = l.Group!.Name,
+            GroupId = l.GroupId,
+
+            LectureHalls = l.LessonAssociations!
+                .Where(la => !string.IsNullOrEmpty(la.LectureHall?.Name))
+                .Select(la => la.LectureHall?.Name),
+            LectureHallsId = l.LessonAssociations!
+                .Where(la => la.LectureHallId != null)
+                .Select(la => la.LectureHallId),
+
+            Campus = l.LessonAssociations!
+                .Where(la => !string.IsNullOrEmpty(la.LectureHall?.Campus?.CodeName))
+                .Select(la => la.LectureHall?.Campus?.CodeName),
+            CampusId = l.LessonAssociations!
+                .Where(la => la.LectureHall?.Campus != null)
+                .Select(la => la.LectureHall?.CampusId),
+
+
+            Professors = l.LessonAssociations!
+                .Where(la => !string.IsNullOrEmpty(la.Professor?.Name))
+                .Select(la => la.Professor?.Name),
+            ProfessorsId = l.LessonAssociations!
+                .Where(la => la.ProfessorId != null)
+                .Select(la => la.ProfessorId),
+
+            LinkToMeet = l.LessonAssociations!.Select(la => la.LinkToMeet)
+        }).ToList();
+
+        return new ScheduleListVm
+        {
+            Schedules = result
+        };
+    }
+}

Application/Cqrs/Schedule/Queries/GetScheduleList/ScheduleListVm.cs

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+using System.Collections.Generic;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.Schedule.Queries.GetScheduleList;
+
+/// <summary>
+/// Represents a view model for a list of schedules.
+/// </summary>
+public class ScheduleListVm
+{
+    /// <summary>
+    /// Gets or sets the list of schedules.
+    /// </summary>
+    public IList<ScheduleLookupDto> Schedules { get; set; } = new List<ScheduleLookupDto>();
+}

Application/Cqrs/Schedule/Queries/GetScheduleList/ScheduleLookupDto.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.Schedule.Queries.GetScheduleList;
+
+/// <summary>
+/// Represents a data transfer object for schedule lookup.
+/// </summary>
+public class ScheduleLookupDto
+{
+    /// <summary>
+    /// Gets or sets the day of the week.
+    /// </summary>
+    public DayOfWeek DayOfWeek { get; set; }
+
+    /// <summary>
+    /// Gets or sets the pair number.
+    /// </summary>
+    public int PairNumber { get; set; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether the pair is on an even week.
+    /// </summary>
+    public bool IsEven { get; set; }
+
+    /// <summary>
+    /// Gets or sets the name of the discipline.
+    /// </summary>
+    public required string Discipline { get; set; }
+
+    /// <summary>
+    /// Gets or sets the type of occupation.
+    /// </summary>
+    public required string TypeOfOccupation { get; set; }
+
+    /// <summary>
+    /// Gets or sets the name of the group.
+    /// </summary>
+    public required string Group { get; set; }
+
+    /// <summary>
+    /// Gets or sets the ID of the group.
+    /// </summary>
+    public required int GroupId { get; set; }
+
+    /// <summary>
+    /// Gets or sets the names of the lecture halls.
+    /// </summary>
+    public required IEnumerable<string?> LectureHalls { get; set; }
+
+    /// <summary>
+    /// Gets or sets the IDs of the lecture halls.
+    /// </summary>
+    public required IEnumerable<int?> LectureHallsId { get; set; }
+
+    /// <summary>
+    /// Gets or sets the names of the professors.
+    /// </summary>
+    public required IEnumerable<string?> Professors { get; set; }
+
+    /// <summary>
+    /// Gets or sets the IDs of the professors.
+    /// </summary>
+    public required IEnumerable<int?> ProfessorsId { get; set; }
+
+    /// <summary>
+    /// Gets or sets the names of the campuses.
+    /// </summary>
+    public required IEnumerable<string?> Campus { get; set; }
+
+    /// <summary>
+    /// Gets or sets the IDs of the campuses.
+    /// </summary>
+    public required IEnumerable<int?> CampusId { get; set; }
+
+    /// <summary>
+    /// Gets or sets the links to online meetings.
+    /// </summary>
+    public required IEnumerable<string?> LinkToMeet { get; set; }
+}